CN111255783B - Fixing and limiting device is taken off in top down antiskid - Google Patents

Fixing and limiting device is taken off in top down antiskid Download PDF

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Publication number
CN111255783B
CN111255783B CN202010069553.8A CN202010069553A CN111255783B CN 111255783 B CN111255783 B CN 111255783B CN 202010069553 A CN202010069553 A CN 202010069553A CN 111255783 B CN111255783 B CN 111255783B
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CN
China
Prior art keywords
power unit
limiting
long screw
nut
screw rod
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CN202010069553.8A
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CN111255783A (en
Inventor
马瑞
曹琳
王志强
刘雄
杜小渊
廉琳
逯玉成
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Crrc Xi'an Yonge Electric Co ltd
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Crrc Xi'an Yonge Electric Co ltd
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Publication of CN111255783A publication Critical patent/CN111255783A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B13/00Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/14Mounting supporting structure in casing or on frame or rack

Abstract

The invention belongs to the technical field of rail transit power electronic devices, and relates to a top-down anti-slip fixing and limiting device, which comprises a screw assembly arranged in a power unit from top to bottom, wherein the screw assembly realizes the assembly and disassembly of the power unit and a bottom plate of a converter device by moving up and down; the screw assembly comprises a long screw, a nut is welded at the top of the long screw, a positioning sheet, a self-locking structure, an elastic cushion and a supporting column are sequentially distributed at the bottom of the long screw from top to bottom, and the distance L1 from the top of the self-locking structure to the positioning sheet is smaller than the height L2 of the supporting column; the anti-slip fixing and limiting device from top to bottom is convenient and quick to operate, does not need to occupy the space of a cabinet body for assembly, can improve the space utilization rate, and is favorable for the miniaturization design of a power unit and a converter; the self-locking anti-slipping design of the screw assembly can improve the installation reliability and usability of the screw assembly.

Description

Fixing and limiting device is taken off in top down antiskid
Technical Field
The invention belongs to the technical field of rail transit power electronic devices, and relates to a top-down anti-slip fixing and limiting device.
Background
The rail transit electric locomotive, the motor train unit and the urban rail vehicle equipment relate to mechanical fixation of a large number of power electronic devices, the equipment fixation mainly comprises two modes of transverse installation and longitudinal installation, and the reliability, the usability and the maintainability of the fixing device play an important role in installation, maintenance and reliable operation of the rail transit equipment. At present, the transverse installation and application of power electronic devices are more, the devices in special fields such as urban rail transit vehicle converter devices are longitudinally installed, the longitudinal installation is limited by space and the operation angle of personnel, and higher requirements are put forward on the installation and fixation of the internal devices.
In the existing horizontal and transverse installation mode, a fixed block is installed inside a power electronic device, mechanical fixation is realized through a transverse long screw rod, and the installation mode is only the installation and fixation of the transverse power electronic device. Because the self-locking and anti-falling functions are not provided, the bolt is easy to loosen in the operation process, the fastener is easy to fall off, and potential safety hazards exist; and the installation precision is not high due to the no limit design. The existing vertical and longitudinal installation modes comprise two types: in the first mode, L-shaped leading-out ends are arranged at four corners of the side surface of the bottom of the power electronic device and are fixed on a bottom plate of the converter device through bolts, and inverted L-shaped leading-out ends are arranged on the side surface of the bottom of the power electronic device and are fixed on a nearby fixed beam of the converter device through bolts; in the mounting mode, the extended L-shaped fixed leading-out end increases the volume of the power electronic device, which is not beneficial to the miniaturization and lightweight design of the power electronic device; the operation space of operators is required to be reserved, the occupied space is large, and the miniaturization and lightweight design of the converter device are not facilitated; the installation and maintenance are inconvenient, bolts of all the fixing points need to be disassembled one by one, each L-shaped fixed leading-out end needs to be calculated by at least 2 fixing bolts, and 4L-shaped fixed leading-out ends need to be disassembled and assembled by at least 8 bolts, so that time and labor are wasted; during later maintenance, the hidden danger that drops exists at the dismouting in-process in bolt and bullet pad. The second installation mode realizes mechanical fixation through a longitudinal long screw rod, a nut used when the longitudinal long screw rod is fixed on a device bottom plate is easy to loosen in the vibration process of vehicle operation, and a spring washer is added on the nut fixed on the device bottom plate through the long screw rod to prevent loosening; in order to prevent the elastic pad from falling out, the processing length of the installation thread at the bottom of the long screw can be limited, and in practical application, the three errors, namely the processing error, the processing error of a power electronic device frame and the installation error, are superposed, so that the limitation precision of the thread length of the long screw is high, and the control is not good in practical application; in addition, the long screw rod is not limited in installation depth due to the limit-free design, and the installation precision is not high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a top-down anti-slip fixing and limiting device, which improves the reliability, availability and maintainability of a power electronic device, is more convenient and quicker to connect, improves the space utilization rate, further simplifies the structure of the device, reduces the volume, and is convenient to install and maintain at a later stage.
In order to achieve the purpose, the invention provides the following technical scheme:
a top-down anti-slip fixing and limiting device comprises a screw assembly which is arranged in a power unit from top to bottom, wherein the screw assembly can assemble and disassemble the power unit and a bottom plate of a converter device by moving up and down; the screw rod subassembly includes the long screw rod, the top welding of long screw rod has the nut, the bottom top-down of long screw rod distributes in proper order has the spacer, self-locking structure, bullet pad, support column, when the bottom surface of support column and the top edge of long screw rod bottom recess are in the coplanar, self-locking structure hugs closely support column upper surface mounting with the bullet pad, and the top of self-locking structure is less than the high L2 of support column to the distance L1 of spacer, in order to guarantee at the dismouting in-process, avoid the support column to drop when the long screw rod is lifted, the bullet pad is on the upper portion of support column simultaneously, can prevent to play the pad and drop at power unit dismouting in-process.
Furthermore, the long screw rod penetrates through a waist-shaped mounting hole in the top of the frame of the power unit, and the bottom end of the long screw rod sequentially penetrates through a mounting hole in the bottom of the frame of the power unit and a mounting hole in the frame of the converter.
Furthermore, the self-locking structure is matched with a right-handed nut through a left-handed nut, and is screwed up or loosened in a contra-rotating mode.
Furthermore, nut anti-loosening liquid is coated on the threads of the left-handed nut and the right-handed nut, so that the locking effect is enhanced.
Further, the nut welded to the top of the long screw is a hexagon nut, when the power unit is installed on the converter, the long screw penetrates through the power unit frame from top to bottom and then is inserted into the bottom plate installation hole of the converter for positioning, then the limiting piece is padded between the bottom surface of the hexagon nut and the top frame of the power unit for limiting, the hexagon nut at the top of the long screw is screwed down by using a fastening tool until the gap between the bottom surface of the hexagon nut and the power unit is equal to the thickness of the limiting piece, then the limiting piece is pulled out, the limiting piece is used for ensuring that each fixed point is fastened firmly and the same, meanwhile, the same installation height of three screw assemblies of the power unit is ensured, and the uniform stress of three installation points of the power unit in the converter is ensured.
Furthermore, a circle of groove is formed in the position, close to the bottom end, of the long screw, and the groove is located below the supporting column; the distance L3 between the lower edge of the groove and the bottom end of the long-screw umbrella cover is slightly smaller than L1 according to actual conditions, and after the long screw is installed and fastened with the converter, the bottom end of the long-screw umbrella cover needs to exceed a bottom plate of the converter and rivet a nut by at least 3 threads so as to ensure reliable connection. When the power unit is conveyed and horizontally put down, the screw rod assembly moves vertically and upwards, and the bottom of the screw rod assembly cannot exceed the bottom surface of the power unit, so that the power unit can be stably placed and horizontally placed. Wherein, the recess has following effect: firstly, when the anti-slip fixing and limiting device is assembled on a power electronic device and is carried, a limiting clamp or a binding belt can be clamped at the position of the groove to prevent the support column from slipping; secondly, when the anti-slip fixing and limiting device is assembled on the power unit, the groove can assist an operator to position the mounting positions of the screw nut and the support column; thirdly, when the power unit is assembled on the converter, the long screw needs to be screwed down and fixed with a pressure riveting nut welded below a bottom plate of the converter, the long screw can be screwed by using a manual tool and can also be quickly screwed by using a pneumatic tool, and the groove can prevent the long screw from touching the edge of the mounting round hole of the bottom plate of the power unit or the edge of the mounting round hole of the bottom plate of the converter when the long screw rotates quickly, so that parts are collided and damaged.
Furthermore, a limiting piece is arranged between the nut and the top frame of the power unit, in the last step of mounting the power unit to the converter, the limiting piece is padded between the nut and the top frame of the power unit, the long screw is screwed down by taking a nut cap at the top of the long screw as a stress point until the gap between the screw assembly and the power unit is equal to the thickness of the limiting piece, each fixed point is ensured to be fastened and fastened firmly, meanwhile, the mounting heights of the three groups of screw assemblies are ensured to be the same, and the stress of the power unit at three mounting points in the converter is ensured to be uniform.
Furthermore, any side of the limiting piece is provided with a semicircular opening, so that the limiting piece can be conveniently drawn out after the power unit and the converter device are installed.
Furthermore, the bottom end of the long screw rod is of an umbrella cover type structure, so that the installation is convenient.
Further, the top of long screw rod is ARC structure, when long screw rod top welding hexagon nut, carries out the chamfer rounding to the top through the welding and handles to make hexagon nut and long screw rod become an organic whole, and this ARC structure has following effect: firstly, a welding stress surface is added, so that the welding of the hexagon nut and the long screw is firmer; secondly, the cambered surface design can prevent long screw rod top tangent plane fish tail operating personnel in transport and operation process.
Furthermore, the support column is a cavity cylinder made of metal, in the process of mounting or dismounting the power unit from the converter, the support column penetrates through the bottom of the long screw, the movable distance of the long screw in the up-down direction in the dismounting process is smaller than the height L2 of the support column, so that the support column cannot slide out and fall off in the dismounting process, and meanwhile, the design of the support column can prevent the gasket from slipping off from the bottom of the long screw in the dismounting process and falling into the mounted power unit or converter.
Furthermore, the self-locking structure can also adopt a locknut, and the special locknut can be purchased from the market to realize the self-locking and anti-loosening effect.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: by adding the design of the self-locking structure on the long screw rod, the bolt loosening phenomenon caused by vibration during the operation of the whole device can be effectively prevented, and meanwhile, the potential safety hazards of elastic cushion sliding and the like are avoided; by adding the supporting columns with a certain height, the problem of the actual assembly process of various components caused by combination errors such as machining errors and assembly errors in the assembly process can be solved, and the problem of high requirement on the machining precision of the components in the whole installation process can be solved, so that the method is simple and easy to implement; according to the limiting device, the screw rod assembly and the power unit are assembled into a whole, the long screw rod can move up and down, and the screw rod does not protrude out of the bottom of the power unit before being installed on the converter, can be horizontally placed, and is convenient to package and transport. Therefore, the limiting device can realize longitudinal assembly between the power unit and the converter device, when the power unit is assembled on the converter device, a fixing component does not need to be disassembled, other fasteners are not needed, the long screw rod is directly fastened from the top, the installation and later maintenance of the whole device are facilitated, the space is saved by the installation layout, the size is reduced compared with the original installation structure, the miniaturization and light-weight design of power electronic devices such as the converter device and the power unit is facilitated, and the maintainability, the reliability and the usability of the whole device are improved.
In addition, the limiting device is additionally provided with the limiting piece, the limiting piece is easy and feasible to process, the mounting height of the long screw is measured, the mounting height of each long screw is guaranteed to be the same, and the three mounting points are stressed uniformly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural view of a top-down anti-slip fixing and limiting device according to the present invention;
FIG. 2 is a schematic structural view of a positioning plate according to the present invention;
FIG. 3 is a schematic structural view of a spacing piece according to the present invention;
fig. 4 is an assembly schematic view of the top-down anti-slip fixing and limiting device and the power unit provided by the invention.
Wherein: 1 is a long screw; 2 is a nut; 3 is a self-locking structure; 4 is an elastic cushion; 5 is a support column; 6 is a positioning sheet; 7 is a groove; 8 is a limiting sheet; 9. and a semicircular opening.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
Examples
Referring to fig. 1-3, the invention provides a top-down anti-slip fixing and limiting device, which comprises a screw assembly arranged in a power unit from top to bottom, wherein the screw assembly realizes the assembly and disassembly of the power unit and a bottom plate of a converter device by moving up and down; the screw rod subassembly includes long screw rod 1, and the top welding of long screw rod 1 has nut 2, and when the screw rod subassembly assembled in power unit, the bottom of long screw rod 1 was locating piece 6, auto-lock structure 3, bullet pad 4, support column 5 from top to bottom in proper order, and the top of auto-lock structure 3 is less than the height L2 of support column 5 apart from the distance L1 of locating piece 6.
Preferably, the nut 2 is a hexagon nut, the hexagon nut is welded on the top of the long screw rod 1, when the power unit is installed on the converter, the long screw rod 1 penetrates through the power unit frame from top to bottom and then is inserted into the converter bottom plate installation hole for positioning, then the limiting piece 8 is padded between the bottom surface of the hexagon nut and the top frame of the power unit for limiting, the hexagon nut on the top of the long screw rod 1 is screwed by a fastening tool until the gap between the bottom surface of the hexagon nut and the top frame of the power unit is equal to the thickness of the limiting piece 8, then the limiting piece 8 is pulled out, the limiting piece 8 is used for ensuring that each fixing point is fastened and fastened firmly, meanwhile, the same installation height of three groups of screw rod assemblies of the power unit is ensured, and the uniform stress of three installation points of the power unit in the converter is ensured.
Further, the self-locking structure 3 is matched with a right-handed nut through a left-handed nut to be screwed up or loosened.
Preferably, the screw thread department of left-handed nut and right-handed nut all is scribbled nut locking liquid to reinforcing locking effect uses common workable part, easy operation, low cost, and the feasibility is strong, and the commonality is high, when effectively preventing the device vibration in service to lead to the bolt not hard up, can also avoid taking place potential safety hazards such as bullet pad landing.
Alternatively, the self-locking structure 3 can also select a locknut, and a special locknut can be purchased from the market, but the price is relatively high. Through the contrast, adopt the double nut anti loosening structure that levogyration nut and dextrorotation nut realized, the cost is lower relatively, and convenient easy the realization.
Further, the long screw rod 1 is a high-strength metal finished product whole body long screw rod, the length of the long screw rod is determined according to the height of a connecting device, a circle of groove 7 is arranged at the position, close to the bottom end, of the long screw rod 1, and the groove 7 is located below the supporting column 5. The distance L3 between the lower edge of the groove 7 and the umbrella cover type bottom end of the long screw rod 1 is slightly smaller than the distance L1 from the top of the self-locking structure 3 to the positioning sheet 6 according to actual conditions, and after the long screw rod is installed and fastened with the converter device, the umbrella cover type bottom end of the long screw rod needs to exceed a base plate of the converter device and press riveting nuts for at least 3 threads, so that reliable connection is guaranteed. When the power unit is conveyed and horizontally put down, the screw rod assembly moves vertically and upwards, and the bottom of the screw rod assembly cannot exceed the bottom surface of the power unit, so that the power unit can be horizontally placed. The grooves 7 have the following functions: firstly, when the anti-slip fixing and limiting device is assembled on a power electronic device and is carried, a limiting clamp or a binding belt can be clamped at the position of the groove 7 to prevent the support column 5 from slipping; secondly, when the anti-slip fixing and limiting device is assembled on the power unit, the groove 7 can assist an operator to position the mounting positions of the screw nut and the support pillar 5; thirdly, when the power unit is assembled on the converter, the long screw rod 1 needs to be screwed down and fixed with a pressure riveting nut welded below a bottom plate of the converter, the long screw rod 1 can be screwed by using a manual tool and can also be quickly screwed by using a pneumatic tool, and the groove 7 can avoid the situation that the long screw rod 1 touches the edge of a mounting round hole of the bottom plate of the power unit or the edge of the mounting round hole of the bottom plate of the converter when rotating quickly, so that parts are collided and damaged.
Further, still be provided with spacing piece 8 between nut 2 and the top frame of power unit, high strength hexagon nut is chooseed for use to nut 2. In the last step of mounting the power unit to the converter, the limiting sheet 8 is padded between the high-strength hexagon nut and the top frame of the power unit, the hexagon nut cap at the top of the long screw 1 is used as a stress point to screw the long screw 1 until the gap between the screw assembly and the power unit is equal to the thickness of the limiting sheet 8, each fixed point is guaranteed to be fastened firmly and the same, meanwhile, the mounting heights of the three groups of screw assemblies are guaranteed to be the same, and the three mounting points of the power unit in the converter are guaranteed to be stressed uniformly.
Preferably, as shown in fig. 3, the limiting piece 8 includes a rectangular piece and a semicircular piece, which are integrally formed into a flat plate, and the left side of the limiting piece 8 is provided with a semicircular opening 9, so that the limiting piece 8 can be conveniently drawn out after the power unit and the converter are installed.
Furthermore, the bottom end of the long screw rod 1 is of an umbrella cover type structure, so that the installation is convenient.
Further, long screw 1's top is ARC structure, and when long screw 1's top welded hexagon nut, carry out the chamfer rounding to the top through the welding and handle and make hexagon nut and long screw 1 become an organic whole, this ARC structure has following effect: firstly, a welding stress surface is added, so that the welding of the hexagon nut and the long screw 1 is firmer; secondly, prevent the top tangent plane of long screw 1 fish tail operating personnel in transport and operation process.
Further, the support pillar 5 is a hollow cylinder made of metal so as to be inserted into the long screw rod 1, the long screw rod 1 is inserted through the middle of the support pillar 5 in the process of mounting or dismounting the power unit from the converter, and the support pillar 5 is used for preventing the gasket from slipping from the bottom of the long screw rod 1 in the process of dismounting and mounting and falling into the mounted power unit or the converter.
Further, as shown in fig. 2, the positioning plate 6 is of a bending structure, one mounting surface of the positioning plate 6 is provided with two small round holes, bolts penetrate through the two small round holes to fix the positioning plate 6 on the power unit frame, the other mounting surface of the positioning plate 6 is also provided with a large waist-shaped hole, the long screw 1 penetrates through the waist-shaped hole of the positioning plate 6 after penetrating through the upper surface of the power unit frame from top to bottom, then penetrates through the counter-rotating nut, the elastic pad 4 and the support column 5 one by one, and then penetrates through the lower surface of the power unit frame downwards. The positioning piece 6 is used for limiting the upward lifting height of the long screw rod 1, and when the power unit is placed on the front plane for installation, the distance L1 between the top of the counter nut and the positioning piece is smaller than the height L2 of the supporting column, so that the situation that the supporting column 5 and the elastic cushion 4 slide down due to the fact that the long screw rod 1 is lifted too much can be avoided.
In summary, the top-down anti-slip fixing and limiting device provided by the invention is used for realizing mechanical connection of longitudinally fixing a power unit in a converter device in the field of urban rail transit from top to bottom to the converter device, has self-locking and anti-slip performances on the premise of realizing mechanical fixation, and simultaneously designs installation limiting to ensure installation accuracy, and the specific implementation mode and the installation process are as follows:
the realization method is as follows: as shown in fig. 1, the long screw 1 is a high-strength metal finished whole body long screw, the length of the long screw is determined according to the height of a connected device, a high-strength hexagon nut is welded on the top of the long screw 1, the top end of the long screw 1 is processed into an arc surface, the bottom end of the long screw 1 can be processed into an umbrella cover type to facilitate installation, a circle of groove 7 is arranged at the position of the long screw 1 close to the bottom end, and when the anti-slip fixing and limiting device is assembled on a power electronic device and is transported, a limiting clamp or a ribbon can be clamped at the position of the groove 7 to prevent the support column 5 from slipping off; in addition, when the anti-slip fixing and limiting device is assembled on the power unit, the groove 7 can assist an operator to position the mounting positions of the screw nut and the support pillar 5; in addition, when the power unit is assembled on the converter, the long screw 1 needs to be screwed down and fixed with a rivet pressing nut welded below a bottom plate of the converter, and the groove 7 can be used for preventing the collision of the long screw 1 on a circular hole of the bottom plate of the power unit and a mounting hole of the bottom plate of the converter during the installation and the screwing. The distance from the groove 7 to the bottom of the high-strength hexagon nut welded on the top of the long screw 1 is equal to the sum of the distance from the upper surface to the lower surface of the assembled power unit frame and the thickness of the limiting sheet.
In order to ensure that the bottom of the power unit is horizontal after the screw assembly is installed in the power unit so as to be convenient to carry and place, the screw assembly can move up and down. When the power unit is horizontally arranged, referring to fig. 4, the screw assembly moves upwards, the bottom of the screw assembly and the bottom of the power unit are in the same plane, the maximum distance L1 of the upward movement of the screw assembly, namely the distance from the self-locking structure 3 to the bottom surface of the positioning plate 6, the height of the supporting column 5 is L2, and setting L1 to be less than L2 can ensure that the elastic pad 4 and the supporting column 5 do not fall off in the processes of dismounting, mounting and carrying of the power unit, so that the limitation that the requirement of combination errors on the processing precision of each component is high is reduced; the distance L3 between the lower edge of the groove 7 at the bottom of the long screw rod 1 and the umbrella cover type bottom end of the long screw rod is slightly smaller than L1 according to actual conditions, and after the long screw rod is installed and fastened with the converter, the umbrella cover type bottom end of the long screw rod needs to exceed a bottom plate of the converter and rivet a nut by at least 3 screw threads so as to ensure reliable connection. The L3 < L1 is set to ensure that when the power unit is conveyed and horizontally laid down, the screw rod assembly moves vertically upwards, and the bottom of the screw rod assembly does not exceed the bottom surface of the power unit so as to ensure that the power unit can be horizontally laid. After the power unit is assembled on the converter device, the screw assembly penetrates downwards into the bottom of the converter device and is screwed with the press riveting nut of the bottom plate of the converter device to play a role in connection and fixation.
The installation process is as follows: with reference to fig. 1, the screw assembly is installed as follows:
firstly, a long screw 1 welded with a high-strength hexagonal nut penetrates through a waist-shaped mounting hole in the top of the power unit, and a press-riveting nut is welded below the mounting hole of a frame in the top of the power unit;
secondly, penetrating the long screw 1 downwards into a positioning sheet 6;
thirdly, sequentially penetrating the self-locking structure 3, the elastic pad 4 and the support column 5 from the bottom end of the long screw rod 1;
adjusting the position of the support column 5 until the bottom surface of the support column is aligned with the upper edge of the groove 7, tightly attaching the elastic pad 4 and the self-locking structure 3 to the support column 5, screwing the double nuts of the self-locking structure 3 in a contra-rotating manner, and simultaneously ensuring the tightness by using the elastic pad 4 and the nut anti-loosening liquid to prevent the looseness caused by vibration in the driving process of the vehicle;
penetrating the assembled screw assembly shown in the figure 1 into a mounting hole of a bottom frame of the power unit, wherein the screw assembly can be pulled up and down to ensure the stability of the power unit when the power unit is independently and horizontally placed while connecting the converter and the power unit;
sixthly, the screw rod assembly is pulled up and down to check and install the screw rod assembly.
By utilizing the triangular stabilizing principle, 3 groups of screw assemblies are assembled on the power unit, the screw assemblies can be pulled up and down, and the maximum distance L1 of upward movement is smaller than the height L2 of the supporting column, so that the supporting column 5 and the elastic cushion 4 can not fall off and slide. The distance L3 of the lower limb of the recess 7 of long screw 1 bottom and long screw umbrella lid type bottom is slightly less than L1 according to actual conditions to when guaranteeing that power unit transport level puts down, screw assembly's bottom can not surpass power unit's bottom surface when screw assembly is vertical rebound, but make power unit level place, convenient transport.
When the urban rail transit converter is assembled on the top of a vehicle body, the converter is opened, parts installed in the converter are all top longitudinal assembly, a rivet pressing nut is welded below a mounting hole of a box body bottom plate of the converter, and the power unit is installed in the converter in the following process:
putting a power unit into a mounting groove of a converter device;
aligning the power unit with the assembled screw rod assemblies with mounting holes among the converter devices, and then screwing 3 groups of screw rod assemblies at three fastening points at the top of the power unit;
thirdly, measuring the mounting height by using a limiting piece 8, ensuring that the mounting heights of the long screws are the same and the stress of the three mounting points is uniform;
fourthly, the limiting sheet 8 is drawn out, and the installation is completed.
Therefore, the anti-slip fixing and limiting device from top to bottom is convenient and quick to operate, the screw assembly can be mounted in the self space of the power unit, meanwhile, the space of the cabinet body is not required to be occupied for assembly, the space utilization rate can be improved, and the miniaturization and light-weight design of the power unit and the converter device is facilitated; each power unit only has three mounting points at the top, and the power unit can be directly screwed in and screwed with a bolt, so that the operation is convenient and fast; the self-locking anti-slipping design of the screw assembly can improve the installation reliability and usability of the screw assembly; the screw assembly and the power unit are integrally assembled in the converter, so that later-stage disassembly and assembly and maintenance are facilitated.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. A top-down anti-slip fixing and limiting device is characterized by comprising a screw assembly which is arranged in a power unit from top to bottom, wherein the screw assembly can assemble and disassemble the power unit and a bottom plate of a converter device by moving up and down; the screw rod assembly comprises a long screw rod (1), a nut (2) is welded at the top of the long screw rod (1), a locating piece (6), a self-locking structure (3), an elastic pad (4) and a supporting column (5) are sequentially distributed at the bottom of the long screw rod (1) from top to bottom, and the distance L1 between the top of the self-locking structure (3) and the locating piece (6) is smaller than the height L2 of the supporting column (5).
2. The top-down slip-prevention fixing and limiting device according to claim 1, wherein the long screw (1) penetrates through a waist-shaped mounting hole at the top of the frame of the power unit, and the bottom of the long screw (1) penetrates through a deflector frame mounting hole at the bottom of the power unit.
3. A top-down slip-resistant fixing and limiting device according to claim 1 wherein the self-locking mechanism (3) is screwed or loosened by a left-handed nut and a right-handed nut.
4. The top-down slip-resistant fixing and limiting device of claim 3, wherein the threads of the left-handed nut and the right-handed nut are coated with nut anti-loosening solution.
5. The top-down anti-slip fixing and limiting device according to claim 1, wherein a circle of groove (7) is formed at a position of the long screw (1) close to the bottom end, and the groove (7) is located below the supporting column (5).
6. A top-down slip-resistant fixing and limiting device according to claim 1, wherein a limiting piece (8) is further provided between the nut (2) and the frame of the power unit.
7. A top-down slip-resistant fixing and limiting device according to claim 6, wherein either side of the limiting plate (8) is provided with a semicircular opening (9).
8. The top-down slip-resistant fixing and limiting device according to claim 1, wherein the bottom end of the long screw (1) is of a canopy-type structure.
9. A top-down slip-resistant fixing and limiting device according to claim 1, wherein the top end of the long screw (1) is of a cambered surface structure.
10. A top-down slip-resistant fixing and limiting device according to claim 1, wherein the supporting column (5) is a hollow cylinder made of metal.
CN202010069553.8A 2020-01-21 2020-01-21 Fixing and limiting device is taken off in top down antiskid Active CN111255783B (en)

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CN111810507B (en) * 2020-06-29 2021-10-22 北京汽车集团越野车有限公司 Dowel pin assembly, manufacturing method and manufacturing device

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Publication number Priority date Publication date Assignee Title
US4118133A (en) * 1976-04-28 1978-10-03 Bbc Brown, Boveri & Company Limited Device for locking electrical units
CN104314940A (en) * 2014-09-01 2015-01-28 株洲南车时代电气股份有限公司 Fall-preventing connecting structure
CN104953857A (en) * 2015-06-18 2015-09-30 国电南瑞科技股份有限公司 Power unit of IEGT (Injection Enhanced Gate Transistor)-based high-power tri-level converter
CN110365086A (en) * 2019-05-31 2019-10-22 西安中车永电电气有限公司 A kind of highly integrated charger power cell
CN209724920U (en) * 2019-03-22 2019-12-03 贵州航天电器股份有限公司 One kind not deviating from bolt structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118133A (en) * 1976-04-28 1978-10-03 Bbc Brown, Boveri & Company Limited Device for locking electrical units
CN104314940A (en) * 2014-09-01 2015-01-28 株洲南车时代电气股份有限公司 Fall-preventing connecting structure
CN104953857A (en) * 2015-06-18 2015-09-30 国电南瑞科技股份有限公司 Power unit of IEGT (Injection Enhanced Gate Transistor)-based high-power tri-level converter
CN209724920U (en) * 2019-03-22 2019-12-03 贵州航天电器股份有限公司 One kind not deviating from bolt structure
CN110365086A (en) * 2019-05-31 2019-10-22 西安中车永电电气有限公司 A kind of highly integrated charger power cell

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